Reamer.



JVF. HERMAN.

KRAMER! \PPLIOATION FILED SEPT. 17. 1913,

lmgg g Patented Aug. 18, 1914.

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J. F. HERMAN.

REAMER.

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To all m may concern it known that I, dorm l. HERMAN, a citizen of the l nited fitotes, residing at B1" lgepert, in the county of Fsirfield and State oi Connecticut, haveiiivented certain new and useful lmprovements in Reamors; and l do hereby declare the following to he a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it epperteins to make and use the same.

This inventioii comprehends improve ments in reamers and rel-altos more portionlorly to those of the type which are provided with a plurolitv of cutters adapted for simultaneous adjustment.

()ne of the objects of-the invention is to provide a reomer of this type which shallsire-hie.

llith these and other objects in view, as will become more apparent as the description proceeds, the invention consists in certale novel features of construction, c0mbinotice and arrangement of pertsos will be her ioe'itcr fully described and claimed.

For eomolete understanding of my inventioii, reference is to he had to the following-descriptiohend accompanying drewings, in whieh- Figure 1 is a side elevation of my im proved reamer, Fig. E is o longitudinal sectionol view with the cutter shown in elevation, Fig. 3 is aside elevation of. the shank and cutter holder which is formed thereon, Fig. 4% is on end eleyetion. of Fig. 3, Fig. 5 is a section taken on the plane of line 55 of Fig.3, Fig. '6 is a central sectional View through one of the barrels, Fig. 7 is on end, elevation of one of the barrels, Fig. 8 is end elevation or the reamer, Fig. 9 is e, transverse fragmentary sectional viewthrough the cutter holder, Fig. 10 is a section on the plane oi" line 10-10 of lBig. 2, v

therewith.

and Fig. 11 is section on the phone of line 11-1l of Fig. 3.

Referring in detail to the drawings by numerals, l designoees, generally, the shank "which is formed. with an externally threaded portion 2 ricer one end of which is also provided an enlarged frosts-conical head 3 upon the outer end thereof. is cylindrical shell or body 2 which forms the holder for thecutters, to he descrihed lster, is formed integrally with the head 8 and is open at its outer end. This shell is formed with longitudinal slots 5 which extend the full length thereof and. which divide said shell into a huiiiher oifi sections e. The foe Ward face of esch of the slots 5 is disggvosed in one of the radii-ii planes of the barrel 2-, esivill be apparent poo reference to Figs, 4cend 8. flhe hood 3 is formed with e plhz rality of slots Y which ore of somewhat less Width then the slots 5 and which ere elineol.

A spindle 8 provided with oppositely threaded portions 9 and 10 respectively, is fitted at one end Within an email opening Ill which extends t'iroo 'h the heed 3 into the.

shank l. The lie is rot'stehly secured within the coercing 11 by ice-ens oi. e hey 12 which hes a threaded head 13 odstoted fit Within the opening laiformed iii the shook 1. The key extends at right angles to the spindle and projects Within an enmilerupon the spindle 8 within the shell 4: end orethreeded upon the portions 9 and 10 of sold spindle. These ho rrels ere cylindrical in form and &TB PI'0V1Cl8(l with s pliirolityof inclined grooves .01 recesses 18, the recesses of one barrel being inclined in or direction opposite to the recesses of the other barrel. These recesses 18 correspond with the slots 5 formed in the shell 4 and are adopted to receive thecutters 19. v

The inner edge of each cutter is parallel with the outer edge for a portion of its ler gth, as indicated by the numeral 20, and

is mclined adjacent its ends, as indicstecl loy the numeral 21. The inclined portions Kim- ride upon the inclined bottom walls of the grooves or recesses 18. The inner end of each of the cutters has formed thereon a longitudinally extendingarm 22 which extends parallel with the slots 7 formed in the head 3. The slots 7 and the arms 22 are inclined at the same angles to the center of the shank 1.

A stop ring 23 is mounted for longitudinal movement upon the portion 2 of the shank 1, and has its'bore enlarged at its outer end to form a channel 2i. This channel is of a frusto-conical shape and the wall thereof is parallel with the outer faces of the arms 22, said arms being adapted to project a distance withinthe chamber, as shown in Fig. 2. The ring is held against rotational movement-by means of the pin 25 which works Within a longitudinal groove :26 formed in the periphery of the portion 2 of the shank. A sleeve or nut 27 is threaded upon the portion 2 of the shank for engagement with the ring 23, and is provided upon its periphery with knurling, as indicated by the numeral 28, and with graduations, indi- 'ated by the numeral 29. The ring 23 carries a zero mark 30 which cooperates with the graduations on the nut so as to indicate the distance which'the nut is rotated. The 30 graduations 29 are spaced with regard to the pitch of the threads upon the nut, and therefore the longitudinal movement of the nut can be easily ascertained. The cutters are fastened securely, to the shell or holder l, by means of screws 81.

'When it is desired to adjust the cutters outwardly, the screws 31 are loosened and the nut, or sleeve 27 threaded inwardly. Then the spindle 8 is rotated by means of a 40 screwdriver inserted in the slot 32 in such a direction as to cause the barrels l6 and 17 to move toward each other. This movenicnt'of the barrels will cause the inclined walls of the recesses 18 to force the cutters outwardly. The limit of this outward movement is checked by the stop ring 23- which overlaps the arms 22, as previously mentioned. When the proper adjustment has been made, the screws 31 are tightened and the reamcr is ready for use. The distance which the cutters move outwardly is determined by the amount of rotation given to the nut 27 since this nut controls the position of the stop ring 23, and the latter in turn controls the movement outward of the arms 22'.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that I have pro vided a very simple and practical reamer in which the. cutters may be simultaneously adjusted with a great degree of accuracy. It Will be understood that the cutters may be provided with different forms of cutting edges and that they may he threaded, if it is desired, so that they may be used for tapping holes.

While I have shown and described the preferred embodiment of my invention, it will be understood thatminor changes in construction, combination and arrangement of parts may be made without departing from the scope and spirit of the invention as claimed.

Having thus described my invention, I claim 1. In a reamer of the character described the combination with a shank, of a hollow cylindrical body formed on one end thereof, the body being provided with longitudinal slots, 2. threa outer end of the shank and extending axially through the body, apair of barrels mounted upon the spindle in threaded engagement therewith, said barrels being formed with oppositely inclined recesses, a plurality of cutters working through the slots formed in the body and seating within the recesses formed in the barrels; aul means for limiting-the outward movement of the cutters in response to the pressure exerted by the barrole.

2. In a reamer the combination of a shank having a frusto-oonical head formed on one end thereof, a hollow shell formed upon the outer end of the head, said shell and head being formed \'\-'1ill slots, a spindle ournaled ed spindle journaled in the in the outer end of the shank and extending axially through the shell, a pair of barrels carried upon the spindle in threaded eugagement therewith, said barrels beii'ig formed with oppositely inclined recesses, a plurality of cutters extending' through the slots in the shell and seating within the recesses, the inner edges of the cutters being inclined to conform to the inclination of the recesses, arms formed upon the inner ends of the cutters for reception within the slots formed in the head; and a stop ring mount- -ed upon the shank and formed with a chamber into which said arms project.

In testimony whereof I afiix my signature in presence of two witnesses.

JOHN F. HERMAN.

Witnesses IRENE QUIN nus, CARL RisiNu. 

